Mammals are arguably the most conspicuous tetrapods in the modern biota. Although there
are fewer extant mammal species (~ 5,500) than birds (~ 10,000) or squamates (~ 10,000) …

We reassess the phylogenetic position of mesosaurs by using a data matrix that is updated
and slightly expanded from a matrix that the first author published in 1995 with his former …

Lystrosaurus was one of the few tetrapods to survive the end-Permian mass extinction
(EPME), the most catastrophic biotic crisis in Phanerozoic history. The significant increased …

The oldest archosauromorphs (dinosaurs, birds, crocodiles, and their stem-taxa) are
recorded in middle− upper Permian rocks, but it was not after the Permo− Triassic mass …

Ophiacodontids have long been considered the basalmost synapsids, and to have retained
a fairly aquatic, piscivorous lifestyle typical of stem-amniotes. A restudy of their bone …

Lalieudorhynchus gandi gen. nov. and sp. nov. is a new caseid synapsid from the Permian
of the Lodève Basin, Occitanie, France. This new taxon is represented by a partial but well …

Mesosaurs have been considered strictly aquatic animals. Their adaptations to the aquatic
environment are well known and include putative viviparity, along with the presence of …

Varanopids were a group of small to medium-sized synapsids whose fossil record spans the
Carboniferous through middle Permian. Although their phylogenetic relationships have …

Based on an exceptionally well-preserved articulated postcranial skeleton, the early amniote
Cabarzia trostheidei gen. et sp. nov. is described. As the lack of the skull hampers its …

There are nearly 6,000 mammalian species, among them our own. Research on our
evolutionary cousins has a long history, but the last 20 years have seen particularly rapid …